Any molecules returned in the iterator have been given titles.
Protein chains are given a shortened version of the input title
combined with the chain ID. Small molecule titles are
residue names. Molecules with more than one residue are combined
with a -. A two residue molecule might have the title XYZ-ABC.
Output molecules also have one or more SD Tags to describe the functional roles.

Warning

The input molecule should contain PDBresidue information
such as residue name, which is used during the
classification process, either from a PDB format file or
through residueperception.
Molecular complexes read from files in formats that lack this
information (for example SDF) may be split inappropriately unless
residues are perceived after input.